Investigate whether changes in prosurvival signaling occur by comparing activation of the signal transducer and activator of transcription-3 (Stat3) and Stat5 pathways in paired diagnostic and relapse samples.

Investigate changes in leukemia cell responses to extrinsic cues from the environment change, using a bone marrow stromal-cell co-culture model of chemotherapy resistance.

OUTLINE: Cryopreserved samples are analyzed for Stat3 and Stat5 expression by flow cytometry and in vitro chemotherapy sensitivity.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01419496